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Class invariant violation
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java.lang.IllegalStateException: Class invariant violation	at org.apache.log4j.LogManager.getLoggerRepository(LogManager.java:199)	at org.apache.log4j.LogManager.getLogger(LogManager.java:228)	at org.apache.log4j.Logger.getLogger(Logger.java:104)	at org.apache.commons.logging.impl.Log4JLogger.getLogger(Log4JLogger.java:283)	at org.apache.commons.logging.impl.Log4JLogger.(Log4JLogger.java:108)